I suppose in the Dresdenverse, guys in their mid 40's can take up combat specialties. In the real world, mortals of that age are on the downward slide towards old age. Sword fighters become good sword fighters because they have the base talent to become so. A large part of that is physicality and good hand eye coordination. They start young, and they practice every day.
We'll see.
Surgeon level coordination and an item that cuts like a scalpel, scalpel weight and with it's own cauterizer. Yea, poor guy won't know how to Larp a lightsaber at 40+ years of nerdism either....
Training and cross training, I got good at chi sau and coordination by being a cashier and handing money back as lightly and efficiently as possible.
....and what about these mortals? -.- Your not one of us, you gave it away with that turn of phrase!